# std::wbuffer_convert<Codecvt,Elem,Tr>::rdbuf

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< cpp‎ | locale‎ | wbuffer convert

std::streambuf* rdbuf() const; | (1) |
std::streambuf* rdbuf( std::streambuf* bytebuf ); | (2) |

1) Returns the pointer to the underlying byte stream.
2) Replaces the associated byte stream with bytebuf.

### Return value

1) `bufptr`
2) the previous value of `bufptr`

### Example

Run this code

    #include <codecvt>
    #include <iostream>
    #include <locale>
    #include <sstream>

    int main()
    {
        // Convert UTF-8 to UCS4
        std::stringbuf utf8buf("z\u00df\u6c34\U0001d10b");
                           // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b"
                           // or u8"zß水𝄋"
        std::wbuffer_convert<std::codecvt_utf8<wchar_t>> conv(&utf8buf);
        std::wistream ucsbuf(&conv);
        std::cout << "Reading from a UTF-8 stringbuf via wbuffer_convert: "
                  << std::hex << std::showbase;
        for (wchar_t c; ucsbuf.get(c);)
            std::cout << static_cast<std::wint_t>(c) << ' ';

        // Reuse the same wbuffer_convert to handle UCS4 to UTF-8 output
        conv.rdbuf(std::cout.rdbuf());
        std::wostream out(&conv);
        std::cout << "\nSending UCS4 data to std::cout via wbuffer_convert: ";
        out << L"z\u00df\u6c34\U0001d10b\n";
    }

Output:

    Reading from a UTF-8 stringbuf via wbuffer_convert: 0x7a 0xdf 0x6c34 0x1d10b
    Sending UCS4 data to std::cout via wbuffer_convert: zß水𝄋

### See also

(constructor) | constructs a new `wbuffer_convert` (public member function)

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